On Thu, Aug 13, 2009 at 6:44 PM, Dan V. <daniel.venkitacha...@gmail.com>wrote:
>
> I'm experiencing some unexpected behaviour.
>
> In my code Category is derived from BaseModel and has a reference to
> another entity (creator). If I initialize categories with a parent I
> can trigger the error.
>
> (from a django shell session)
>
> a = Category('A', creator=my_guy)
> a.save()
> assert(Category.get_by_id(a.key().id())) # OK, no parent
>
> b = Category(parent=my_guy, 'B', creator=my_guy)
> b.save()
> assert(b.key().id()) # OK, key exists
> assert(Category.get(b.key())) # OK as well
> assert(Category.get_by_id(b.key().id())) # raises AssertionError
>
> So even though the key appears to be valid and have a numeric
> identifier it cannot be used with get_by_id without throwing. Have I
> missed something here?
You need to pass the parent in with the get_by_id call so it can generate
the proper key.
http://code.google.com/appengine/docs/python/datastore/modelclass.html#Model_get_by_id
--
Matt McDonald
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